Twice as efficient as H.264
The advantage of HEVC: The standard requires half the bandwidth for high quality video transmission. But how is it being done? "Parts of H.264 were subsumed and optimized," explains Dr. Thomas Schierl, group manager of multimedia communications at HHI. "One example is the block size: whereas H.264 subdivides the transmission image into blocks of 16 by 16 pixels, HEVC instead carves the image into blocks of varying sizes with up to 64 by 64 pixels. These larger blocks can be encoded considerably more efficiently." If an object is seen in the image that moves to the side, then this movement occurs smoothly. The standards establish the movement data for each block - data that is ordinarily transmitted once per block. Because the blocks in HEVC are substantially larger than in H.264, correspondingly less movement data are needed. Compared to H.264, since the computational effort for the higher coding efficiency increases sharply to encode or decode the images, HEVC in the standard design allows computer units to work parallel with each other. Either the image is separated out into several parts, known as tiles, whereupon each processor works on one of them, or in the wave front method, where the processors each handle one block of lines in the image. These methods allow encoder manufacturers to get implementations and products to market rapidly.
The development is scheduled for completion in January 2013. Thereafter, new televisions, smartphones and PC units will presumably contain decoders that convert data encoded with HEVC into high-resolution television images. The HEVC standard for 3D movies should follow in one to two years. HEVC will be presented at the IBC in Amsterdam from September 7-11, 2012 in Hall 8, Booth B80. Visitors can watch a full HD film on an HD television being converted live by the HEVC decoder into high-resolution telev
|Contact: Thomas Schierl|